Ernad Husremović hernad

Enable `systemd` in WSL 2

**NOTE: If you have Windows 11 there is now an official way to do this in WSL 2, use it if possible - see MS post here (WINDOWS 11 ONLY)**

This guide will enable systemd to run as normal under WSL 2. This will enable services like microk8s, docker and many more to just work during a WSL session. Note: this was tested on Windows 10 Build 2004, running Ubuntu 20.04 LTS in WSL 2.

To enable systemd under WSL we require a tool called systemd-genie
Copy the contents of install-sg.sh to a new file /tmp/install-sg.sh:

Error

[Tue Jul 30 23:32:08.018098 2019] [proxy:error] [pid 1845] (13)Permission denied: AH00957: HTTP: attempt to connect to 0.0.0.0:3000 (0.0.0.0) failed
[Tue Jul 30 23:32:08.018168 2019] [proxy:error] [pid 1845] AH00959: ap_proxy_connect_backend disabling worker for (0.0.0.0) for 60s

Resolution

How to use VFIO to assign a device to nested VM

Here the vfio-pci device is passed in into the L1 VM
The L1 VM is setup with kernel_irqchip=split
The L0 exposes a virtual IOMMU to the L1 VM

qemu-system-x86_64 \
    -machine q35,accel=kvm,kernel_irqchip=split \
    -enable-kvm \

Recover a qcow2 image using fsck

Load network block device module:

# modprobe nbd max_part=8

Poweroff machine:

# virsh destroy virtual-machine

A guide to writing a language grammar (TextMate) in Atom

Tree sitter

Atom is transitioning to an entirely new way of defining grammars using tree-sitter. This will be enabled by default quite soon now. It is theoretically faster and more powerful than regex based grammars (the one described in this guide), but requires a steeper learning curve. My understanding is that regex based grammars will still be supported however (at least until version 2), so this guide can still be useful. To enable it yourself, go to Settings -> Core and check Use Tree Sitter Parsers

Links for tree-sitter help:

tree-sitter: the main repo
tree-sitter-cli: converts a JavaScript grammar to the required C/C++ files
node-tree-sitter: module to use Tree-sitter parsers in NodeJS
[My guide on starting a Tree-sitter grammar

Switching between AHCI and RAID on the Dell XPS 15 (9560)

This guide likely applies to other models and, potentially, even laptops from other OEMs that have NVME drives. However, I've only tested this on my Dell XPS 15 (9560) with the OEM Windows installation from the Signature Edition model.

Switching from RAID to AHCI

Switching from RAID to AHCI is significantly simpler than switching from AHCI to RAID. All that's needed is a successful boot to Safe Mode.

To set the default boot mode to Safe Mode, use msconfig.exe or open an admin cmd/PowerShell window and run:

	<odoo>
	<record model="report.paperformat" id="paperformat_attendance_recap_report">
	<field name="name">paperformat.attendance.recap.report</field>
	<field name="default" eval="True"/>
	<field name="format">A4</field>
	<field name="page_width">0</field>
	<field name="page_width">0</field>
	<field name="orientation">Portrait</field>
	<field name="margin_top">30</field>
	<field name="margin_right">5</field>

	#!/bin/bash
	# As described in https://bugs.launchpad.net/bugs/1766076
	### Installation Instructions:
	# 1. Install file into `/usr/local/bin/reset-tb`
	#
	# 2. Optional: allow password less sudo by creating a file `/etc/sudoers.d/allow-reset-tb` with the following content:
	# ----8<-----
	# <your username> ALL = NOPASSWD: /usr/local/bin/reset-tb
	# ----8<-----
	#

	#!/bin/bash

	# Install OnlyOffice Document Server on clean CentOS 7 base (may not work on non fresh systems) without asking anything
	# HOW TO: just open a root terminal and brutally copy/paste this gist to your shell.
	# SSL READY: featuring also a lazy-boy-style oneliner to get SSL cert from Let's Encrypt ( see bottom of this gist )

	curl -sL https://rpm.nodesource.com/setup_8.x \| bash -

	cat << EOF > /etc/yum.repos.d/nginx.repo
	[nginx]